JS: Math trig functions. sin, cos, tan, asin, acos, atan

Math.sin(x)

Sine function.

All trig functions's argument are radians.

console.log( Math.sin(3.14) )
// 0.0015926529164868282

console.log( Math.sin(Math.PI) )
// 1.2246467991473532e-16

• Sine Curve

Math.cos(x)

Cosine function.

Math.tan(x)

Tangent function.

Math.asin(x)

Inverse of sine. Domain is -1 to 1. Range is 0 to pi.

Math.acos(x)

Inverse of cosine. Domain is -1 to 1. Range is 0 to pi.

Math.atan(x)

Inverse of tangent. No restriction on domain. Range is -pi/2 to pi/2.

Math.atan2(y, x)

Return the arc tangent of the quotient y/x, where the signs of y and x are used to determine the quadrant of the result. Result is in range from −pi to +pi.

convert degree and radian

// convert degree to radian
let xdegree = 89;
console.log( "xradian is:", xdegree * Math.PI / 180);
// xradian is: 1.5533430342749535

// s------------------------------

// convert radian to degree
let xradian = 1.55;
console.log( "degree is:", xradian * 180 / Math.PI);
// degree is: 88.8084582452776